AK4184 Datasheet, PDF (20/36 Pages) Asahi Kasei Microsystems – TSC with Keypad Scanner and GPIO Expander

[AK4184]
■ Keypad, GPIO, LED Contrast Control
The control command format for accessing the keypad scanner, GPIO, and LED contrast control is described in Table
10.The sequence of writing to and reading from the registers is shown in Table 12, Table 13. The upper MSB byte
(touch screen command) of the control command is set to zero when assessing these blocks. Refer to Table 4 for the
control and read data formats.
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1
D0
0 0 0 0 0 0 0 0 W/R PAGE
ADDR[5:0]
Table 9. Keypad, GPIO, LED Contrast Control Command Format
Bits Name
Description
7
W/R Write/Read bit
0: Write
1: Read
6
PAGE Page bit (Table 3)
5:0 ADDR _{Address bit (Table 4)}
Table 10. Control Command
1. Write Operation
CSN
SCLK
1 2 3 8 9 10 11 12 13 14 15 16 17 18 19
25 26 27 28 29 30 31 32
DIN
DOUT ^Hi-Z
W/R Page
ADDR[5:0]
Control Command
“0”
15 14 13 8 7 6 5 4 3 2 1 0
Control Data
Hi-Z
Figure 10. Write Operation
2. Read Operation
CSN
SCLK
1 2 3 8 9 10 11 12 13 14 15 16 17 18 19
25 26 27 28 29 30 31 32
DIN
DOUT ^Hi-Z
W/R Page
ADDR[5:0]
Control Command
“0”
15 14 13 8 7 6 5 4 3 2 1 0 ^Hi-Z
Read Data
Figure 11. Read Operation
MS0603-E-00
20
2007/04